Effect of crystal orientation relationship on anisotropic inducement in the HDDR treated Nd-Fe-B alloys

Satoshi Sugimoto, Satoshi Ohga, Toshio Kagotani, Koichiro Inomata

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Nd-Fe-B powders produced using HDDR process, are useful for the production of high performance anisotropic bonded magnets. Recently, the authors clarified the temperature dependence of the recombination pressure of the Nd2Fe14B compound, and established the necessary HDDR treatment conditions for the production of high performance anisotropic ternary alloy powders. The newly proposed HDDR treatment was a combination of heat treatments, at hydrogen pressures close to the recombination pressure of the Nd2Fe14B compound, in both the disproportionation and recombination stages. Namely, the combination of v-HD or l-HD (heating in vacuum or in a low H2 pressure, respectively, during the Hydrogenation Disproportionation stage), and s-DR (heating in Ar or in hydrogen with hydrogen pressure close to the recombination pressure for 10 min, at the start of the Recombination) treatments. In this investigation, using anisotropic sintered bodies, the crystal orientation relationship between the parent Nd2Fe14B phase and the disproportionated mixture during the new HDDR treatment was investigated by using XRD and TEM, and its effect on the anisotropic inducement was discussed.

Original languageEnglish
Title of host publicationINTERMAG Europe 2002 - IEEE International Magnetics Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)0780373650, 9780780373655
DOIs
Publication statusPublished - 2002
Event2002 IEEE International Magnetics Conference, INTERMAG Europe 2002 - Amsterdam, Netherlands
Duration: 2002 Apr 282002 May 2

Other

Other2002 IEEE International Magnetics Conference, INTERMAG Europe 2002
CountryNetherlands
CityAmsterdam
Period02/4/2802/5/2

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering
  • Surfaces, Coatings and Films

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